Plate glass



Aug. 17 1926. 1,596,640

\ I... VON REIS mm'non, AND PLANT FOR manumcwuaxue PLATE GLAssFiled'April 2a, 1926 Patented 17, 19216.

palette "-aiiis FiFHQEB LAMBERT voa REIS, or nnaz oennnarn, GERMA Y.

METHOD AND'PLANT FOR MANUFACTURING PLATE GLASS.

Application filed April 28, 1926, Serial No. 105.319, and in Germany May4, 1925.

them trom warping); or cracking because of lu-ing excessively cooleddown by remaining too. lon, in the atn'iosphere or in contact withthetaloles designed to receive the rolled plates and convey them tot-hesaid kiln. To this end, it hashitherto been customary to carry the plateimmediately after or even during the rolling on a conveying table to theopening otthe annealing kiln and shitting it into the kiln soon as thiscan he done without affecting the consistency of the plate. Itcomparatively small glass plates are made. this known methodcan beapplied without any danger tor the plates. Howthis method encountersserious diiticultics in the manutacture of particularly large platessuch as of plates made each. from the whole contents of a large meltingpot. "tore the plates can be introduced into the annealing kiln the partof such large plates rolled out first is already relatively cold, whilethe intermediate or last part is still very hot. the shifting of such aplate into the annealing kiln until the intermediate and rear parts havealso become so hard that the plate can stand the shifting into the kiln.Owing to the large size of the plate it has, however,

occurred that the part rolled out first had already warped or crackedbefore the intermediate and last part had attained the hardness requiredfor theintroduction into the kiln. In such cases, the plates thereforebe come wholly or partly useless. With a view oi remedying thisdrawback, it has been pro-- posed to seize the plate at its tore-end,which of course solidifies first, and to shift. it in this way into thekiln. But in this case, it

is necessary to leave the plate on its first.

place in the annealing kiln for a relatively long time in order tosubject it to a heat interchange in all its parts and remove thestresses still prevailing in it.- It has further been proposed toprotect the plates against the influence ot the atmosphere byconveying.tlie1ntlirougl1 conduits and preventing in this way anexcessive cooling down of the plates during their travel to theannealing kiln. These conduits are, however, very expensive audimpedimental in service and besides have the disadvantage of renderingit .ing a certain part of the table.

foremost third partot' the table, i. e. the end It is theretorenecessaryto delay impossible to satisfactorily watch the glass so that severelosses are liable to he entailed. Now, the invention has for its ObJGCtto do vise a method by which the said disadvantages are avoided in asimple and etlicient This method consists in mamtaniplates. l lccordingto the prevailing circumstances, the plates are only partly cooled oronly partly heated or they are partly cooled and partly heated at thesame time.

For carrying out the method, the portable receiving and conveying tablefor the gla. s plates made on the glassi'olling machine is, forinstance. provided with means for heat Thus, the

ot the table which receives the part of the plate rolled out first, mayhave mounted in it a heating device which heats the table surface fromwithin and therefore. keeps the part of the plate rolled out first sowarnr that a too rapid cooling down of thatplate part and the consequentdisadvantages are avoided. V effected by means of electric current, gas,

steam, coal, coke or the like. For obtaining a heat interchange in allparts o'fthe plate, there maybe used 1n comblnation with the heatingdevlee in the tore-end of the table a cooling device which consists, forinstance,

of one or more air blowers or similar means designed to act from aboveon the intermediate or rearmost'part of the glass plates which is stillvery hot immediately after it has been rolled out. As a result of theheating of the forepart and simultaneous cooling of the rear part arapid heat interchange is attamed. The blowers may have different powersso as to act with different intensities .on the plates as may sometimesbe desirable.

The heating of the table may be The accompanying drawing illustrates,

by way oieXample, some devices for carrying out the new method.

Fig. 1 is a side elevation, partly insection, of a. glass rollingmachine and a conveying table provided in its fore-part with an electricheating device;

Fig. 2 is a side elevation of a similar device including a conveyingtable and a large blower arranged above the rear part of the table;

Fig. 8 is a similar side elevation illustrating two conveying tablesprovided in the fore-part with a coal furnace and one having arrangedabove its rear part three blowers of different powers.

Referring first to Fig. 1, a designates a glass rolling machine, I) is areceiving and conveying table for the glass plates rolled out by themachine 1c is an electric heating device mounted in the fore-part of thetable, and dare contacts adapted to connect the heating device 0 withthe current lines 6. At the proper time, the tore-part of the table isheated by means of the heating de vice c to a suitable temperature,thereby preventing the fore-end of the rolled glass plate from coolingdown too quickly and rendering it possible to introduce the plate intothe annealing kiln in a condition in which all parts of the plate havethe same temperature.

According to Fig. 2 an air blower fis arranged above the receiving andconveying table 6. This blower serves to blow air on the rear part ofthe plate, which when leaving the rolling machine a is always hotter"than the fore-part of the'plate, and to cool the rear part down to atemperature cor responding to the temperature of the fore part. I p vFig. 3 shows the combination of the de vices according to Figs. 1 and 2.The ar rangement is, for instance, so that the foremost third of theplate is heated by the device 0, while the two last thirds of the plateare cooled by means of air blown on them by air nozzles 2', h and gwhich are of powers gradually increasing toward the rear end of theplate. In this case a very quick heat interchange throughout the wholeglass plate is attained.

Having thus described my invention, what I claim as new and desire tosecure by Let ters-Patent is l. The method of manufacturing plate glass,which consists in rolling the glass plates on a rolling machine,carryii'ig the rolled glass plates from the rolling ma chine to anannealing kiln, and while on heir way to this-kiln heating that part olthe plates which has beenrolled out first.

2. The method of manufacturing plate glass, which consists in rollingthe glass plates on a rolling machine, -arrying the rolled glass platesfrom the rolling machine to an annealing kiln, and while on their way tothis kiln cooling that part of the plates which has been. rolled outlast.

3. The method of manufacturing plate glass which consists in rolling theglass plates on a rolling machine, carrying the rolled glass plates fromthe rolling machine to an annealing kiln, and while on their way to tlis kiln heating the fore-part and simultancoiiisly cooling the rear partof the plates.

i. In a plant. for manufacturing plate glass, comprising a rollingmachine, traveling tables for receiving the rolled glass plates andcarrying them to an annealing kiln, and means for heating the fore-partof tlie tables.

5. In a plant for manufacturing plate glass, comprising a rollingmachine, travel ing tables for receiving the rolled glass plates andcarrying them to an annealing kiln, and means for cooling the rear partof the tables. i

' 6. In a plant for manufacturing plate. glass," comprising arollingmachine, traveling tables for receiving the rolled glass plates andcarrying them to'an annealing kiln, andmeans for heating the fore-partand simultaneously cooling the rear part of the tables.

In testimony whereof I have signed my name to this specification.

LAMBERT VON REIS.

